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84=7q+7
We move all terms to the left:
84-(7q+7)=0
We get rid of parentheses
-7q-7+84=0
We add all the numbers together, and all the variables
-7q+77=0
We move all terms containing q to the left, all other terms to the right
-7q=-77
q=-77/-7
q=+11
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